We draw 6 feet too. You shouldn't have any problem getting into Boot Key harbor, especially to the
marinas before the
mooring field. The bridge shown leading to the
mooring field is in a permanently up position.
The red markers are
marinas. Clicking on them will get many details and
reviews about each one. The three main facilities with fuel before the mooring field are Marathon Marina and Boatyard, Pancho's Fuel
Dock, and Burdines Waterfront. All have
current fuel prices too in the red markers.
If you pan the map over to the east, you'll see the bridge (blue marker - saying that it has been removed) and then the very large mooring field.
We spent a month on a mooring in the mooring field. Getting in there with a 6' draft isn't any problem at all especially if you're staying on the 16 larger (45'+) moorings. There is a section of the fairway toward the main part of the mooring field where there is a 5.5' bump. If you'll be going back there, ask the municipal marina that runs the mooring field for guidance to get around it.